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Total emissions in New Zealand from sheep are 10.6 per cent lower than they were under the current emission factors, beef cattle emissions 5 per cent lower and dairy cattle emissions 1.4 per cent lower.

''Across the whole agriculture scene we are going to see a (total) reduction of 4.4 per cent in greenhouse gas emissions from the agricultural sector,'' Van der Weerden said.

It could be seen as welcome news for the farming sector which often gets the blame for greenhouse gas emissions.

''It's important to note that it isn't any mitigation strategy, as it is really a more accurate accounting of the emissions coming from the agricultural sector," Van der Weerden said.

''It is good news in terms of ensuring we are getting a more accurate assessment of what those emissions are (but) at the same time agriculture is still the largest contributing sector,'' he said.

''At the end of the day we have two topography classes - flat land and low-sloping land - with one set of emission factors for urine, and then for medium and steep-sloping land another set of urine emission factors.''

Van der Weerden said there were implications for New Zealand achieving net-zero nitrous oxide emissions by 2050.

''It suggests the actual amount that needed will be a little bit lower for sheep and beef farmers than it was previously.'

''There are implications there but that's a policy-type decision that needs to be made further on down the track.''